Marmalade generally refers to a fruit preserve made from the juice and peel of citrus fruits boiled with sugar and water. It can be produced from kumquats, lemons, limes, grapefruits, mandarins, sweet oranges, bergamots, and other citrus fruits, or any combination of them. For many decades now, the preferred citrus fruit for marmalade production in Britain has been the Spanish Seville orange, Citrus aurantium var. aurantium, prized for its high pectin content, which gives a good set. The peel imparts a lively bitter taste to the marmalade.